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Can anyone confirm the sound you are getting from the H50's pump?
Mine seems to make a slight rattling sound similar to a hard drive clicking. It's not mega loud but definately noticeable over the other stuff in my case.
I used to have a custom water setup and when I initially fired it up it was noisey because of the little air bubbles but it soon settled down to the point where I could only hear the pump humming. Never had any rattling from that.
Silent here.